Dr. Guy W. Beakley Profile

Dr. Guy W. Beakley

at Hicks & Associates Inc

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Publications (4)

Proceedings Article | 19 November 2003 Paper

Application of H.264 for DoD sensor systems

Guy Beakley, Stephen Long, Thomas McMahon, Walter Gish, Pankaj Topiwala

Proceedings Volume 5203, (2003) https://doi.org/10.1117/12.512563

KEYWORDS: Standards development, Video compression, Video, Image quality standards, Picosecond phenomena, Video surveillance, Image compression, Semantic video, Unmanned aerial vehicles, Image quality

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Proceedings Article | 22 September 2003 Paper

Project Responder: technology needs for local emergency response

Guy Beakley, Thomas Garwin, Neal Pollard, George Singley, Robert Tuohy, Jasper Lupo

Proceedings Volume 5071, (2003) https://doi.org/10.1117/12.500827

KEYWORDS: Weapons, Sensors, Chemical elements, Explosives, Weapons of mass destruction, Biological weapons, Industrial chemicals, Computer security, Commercial off the shelf technology

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Proceedings Article | 2 May 1994 Paper

Computer-based testing of digital video quality

Christopher Cressy, Guy Beakley

Proceedings Volume 2187, (1994) https://doi.org/10.1117/12.174973

KEYWORDS: Video, Distortion, Video compression, Analog electronics, Image registration, Error analysis, Video processing, Signal to noise ratio, Image processing, Computer programming

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Proceedings Article | 19 January 1993 Paper

Evaluation of compressed digital high-definition video transmitted through the NASA communications system

Guy Beakley, Elliott Kohn

Proceedings Volume 1757, (1993) https://doi.org/10.1117/12.139134

KEYWORDS: Video, Cameras, Signal to noise ratio, Zone plates, Televisions, Data communications, Telecommunications, Satellites, Video compression, High speed photography

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A series of experiments was conducted over the past three years to prepare NASA for the use of high-definition television. In 1989 and in 1990, HDTV technology was evaluated for potential use in launch operations, real-time image analysis, and media dissemination at the Kennedy Space Center (KSC). Evaluation of camera and lens performance is reported here. In November 1991, an experiment was done at the Johnson Space Center (JSC) to evaluate the quality of HDTV that was digitized, compressed to a 45 Mbps data stream, and transmitted through the NASA communications network. The JSC experiment consisted of back-to-back bench tests of the Alcatel/Telettra high-definition coder/decoder (codec), followed by data transmission through the NASA Shuttle communications simulator, and most importantly, actual transmission through the NASA Tracking and Data Relay Satellite System (TDRSS), with a second satellite hop through a domestic satellite and a fiber-optic link at JSC. Static and dynamic test signals were used to test codec performance as were various types of subjective- test scenes with detail and motion. Included in the subjective material was IMAX film shot in space and transferred directly to high-definition video at 30 frames/second. Static tests highlighted the effects of the 54 MHz sampling rate in the codec. Color reproduction tests showed very little color error, even when transcoding externally from GBR signals. Dynamic test signals characterized the DCT and motion-compensation algorithm. Frame-by-frame analysis showed a small reduction in horizontal resolution, small color errors in fine detail, and reduced horizontal and vertical resolution immediately following transitions, where the effect was almost entirely masked by the transitions. Subjective codec performance on moving images at nominal TDRSS bit-error-rates (BER) was extremely good. The codec designers have done a very good job of leaving out information that is not perceived while including almost all information that is needed. Expert viewers, trained in image analysis, gave excellent ratings to the system at typical TDRSS signal levels.

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